<template>
  <div class="component-upload-image">
    <div class="upload-box">
      <div class="image-list" v-for="(item, index) in fileList" :key="index">
        <el-image :src="item" fit="contain"></el-image>
        <div class="mask"></div>
        <div class="icon-btn">
          <Search @click="handlePictureCardPreview(item)" />
          <Delete @click="deleteImage(item)" v-if="showDelete" />
        </div>
      </div>
      <el-upload
        v-if="fileList.length < limit"
        multiple
        :action="uploadImgUrl"
        list-type="picture-card"
        :on-success="handleUploadSuccess"
        :before-upload="handleBeforeUpload"
        :limit="limit"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        :show-file-list="false"
        ref="imageUpload"
        :headers="headers"
      >
        <el-icon class="avatar-uploader-icon">
          <Plus />
        </el-icon>
      </el-upload>
    </div>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
      <span v-if="sizeText">{{sizeText}}</span>
    </div>
    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" alt="" />
    </el-dialog>
  </div>
</template>

<script setup lang="ts">
import { ComponentInternalInstance } from "vue";
import { propTypes } from '@/utils/propTypes';
import {globalHeaders} from "@/utils/request";
import {Delete, Search, Plus} from '@element-plus/icons-vue';

const props = defineProps({
  modelValue: {
    type: String,
    default: ''
  },
  // 图片数量限制
  limit: propTypes.number.def(5),
  // 大小限制(MB)
  fileSize: propTypes.number.def(5),
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: propTypes.array.def(["png", "jpg", "jpeg"]),
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  showDelete: {
    type: Boolean,
    default: true
  },
  sizeText: {
    type: String,
    default: ''
  }
});

const { proxy } = getCurrentInstance() as ComponentInternalInstance;
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref<any[]>([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + "/resource/oss/upload"); // 上传的图片服务器地址
const headers = ref(globalHeaders());

const fileList = ref<string[]>([]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
);

const imageUploadRef = ref<ElUploadInstance>();

watch(() => props.modelValue, async (val: string) => {
  if (val) {
    fileList.value = val.split(',')
  }
}, { deep: true, immediate: true });

/** 上传前loading加载 */
const handleBeforeUpload = (file: any) => {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some((type: any) => {
      if (file.type.indexOf(type) > -1) return true;
      return fileExtension && fileExtension.indexOf(type) > -1;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy?.$modal.msgError(
      `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy?.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
const handleExceed = () => {
  proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
  if (res.code === 200) {
    uploadList.value.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy?.$modal.closeLoading();
    proxy?.$modal.msgError(res.msg);
    imageUploadRef.value?.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 上传结束处理
const uploadedSuccessfully = () => {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f).concat(uploadList.value.map((item) => item.url));
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", fileList.value.join(','));
    proxy?.$modal.closeLoading();
  }
}

// 上传失败
const handleUploadError = () => {
  proxy?.$modal.msgError("上传图片失败");
  proxy?.$modal.closeLoading();
}

const deleteImage = (url: string) => {
  fileList.value.forEach((item, index) => {
    if (item === url) {
      fileList.value.splice(index, 1)
    }
  })
  emit('update:modelValue', fileList.value.join(','))
}

// 预览
const handlePictureCardPreview = (url: string) => {
  dialogImageUrl.value = url;
  dialogVisible.value = true;
}
</script>

<style scoped lang="scss">
.upload-box {
  display: flex;
  flex-wrap: wrap;
}
.image-list {
  position: relative;
  box-sizing: border-box;
  width: 148px;
  height: 148px;
  margin-right: 2px;
  border: 1px solid #c0ccda;
  border-radius: 6px;
  &:hover .mask {
    display: block;
  }

  &:hover .icon-btn{
    display: flex;
  }

  .el-image {
    width: 100%;
    height: 100%;
  }
  .mask {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .5);
    display: none;
    z-index: 998;
    transition: all 1s;
  }
  .icon-btn {
    width: 70px;
    height: 20px;
    justify-content: space-evenly;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 20px;
    display: none;
    z-index: 999;
    cursor: pointer;
  }
}
</style>
